Need help with my physics hw?

[magicman92]

To study damage to aircraft that collide with large birds, you design a test gun that will accelerate chicken-sized objects so that their displacement along the gun barrel is given by x=(9.0×103m/s2) t2−(8.0×104m/s3) t3. The object leaves the end of the barrel at t=0.025s.

How long must the gun barrel be?

What will be the speed of the objects as they leave the end of the barrel?

What net force must be exerted on a 1.50-kg object at t=0?

What net force must be exerted on a 1.50-kg object at t=0.025s?

[JSmuve]

A) sub t=0.025s into the equation to get x
B) find the first derivative of the equation and sub t=0.025s into it
C) find that second derivative of the equation. Sub 0 as t and multiply your answer by the mass
D) do the same as c but with t=0.025

[Anonymous]

Just do some calculus and you're done